New install for old user need to know "must have" plugins

Hi all. I think this is where I should be. I had not upgraded my calibre for a couple of years because my desktop is not functioning. Got fed up and finally installed it on my amd laptop although it is a pain to be down to 8 gig ram.

My problem? I have not kept up for almost 2 years on the plugins and I used a lot of them regularly.

I would like to have a "Must Have" list of plugins for a user who has a library of over 300,000 "books" (we could also say books and documents).

I used to clean up most books once I got them into Calibre and I like the getfilename to have the info from the filename in case a metadata search somehow changes (yeah, I know it's me hitting something) the title/author series etc. I like to remove static bookmarks so the book when I load it on my reader/tablet/phone will open fresh with no previous reading history.

So, If you have the time, what plugins would you consider essential to a clean install of Calibre.

Thanks for your time
Kate